KHS DJ300 - Rigid Fork Possible?

I'm looking to build a DJ/Park bike for my son and there's a possibility of getting a KHS DJ300 frame. Can I put a rigid fork instead of a suspension fork on this frame? It will be his first DJ/Park bike and I'm trying to keep it as light (and cheap) as possible. Thanks.

After further research, I'm going to go with a BMX bike as cglasford suggested. I might end up buying the KHS for me so I can go riding with him, as my MTB is not well suited for this type of riding. Thanks.